报告题目：Novel insights into the structure of plant cellulose fibrils using solid state nuclear magnetic resonance

　　报告时间：2024年9月26日上午9:00-12:00

　　报告地点：造纸D楼306会议室

　　报告人：Prof. Paul Dupree

　　邀请人：付时雨教授

　　主办单位：华南理工大学制浆造纸工程国家重点实验室、轻工科学与工程学院

　　报告摘要：

　　The structure of native plant cellulose, despite its abundance and utility in industry, remains elusive. Solid state NMR is often used to measure crystallinity of cellulosic materials, and also to estimate fibril diameter. The crystal packing in the cellulose fibril is thought to be cellulose Ibeta with components of cellulose ialpha. To determine the validity of these measurements and hypotheses, the cellulose structure of several species was studied using 2D solid-state Nuclear Magnetic Resonance (NMR) of 13C labelled plants. Six major glucose environments were resolved which are common to the cellulose of poplar wood, spruce wood and grasses. The cellulose structure was maintained in isolated holo-cellulose nanofibrils, allowing more detailed characterisation of purified materials. Prof. Paul Dupree will present evidence resolving the controversies of the crystal packing of plant cellulose, and argue we need to revise our understanding of amorphous cellulose and change our usage of the cellulose crystallinity index. Prof. Paul Dupree will also propose new ways to interpret the NMR data.

　　报告人简介：

　　Paul Dupree is Professor of Plant cell biology, in the department of Biochemistry, University of Cambridge. Research in the Dupree Group involves using genetic and biochemical techniques, in conjunction with mass spectrometry- and nuclear magnetic resonance-based methods, to study the structure and synthesis of plant cell wall polysaccharides such as glucomannan, xylan and cellulose. His aim is to understand the assembly of of the plant cell wall and so to understand better the properties of wood and wood-derived materials. Prof Dupree is interested in applying knowledge of plant cell wall polysaccharides to improve dietary fibre in foods and to improve applications of wood in biomaterials. He is named by Clarivate as one of the world's most highly cited scientists.